define(function(require, exports, module) {
    
    function box2(opt) {
        if (!(this instanceof box2)) {
            return new box2(opt);
        }
    }

    box2.prototype = {
        init: function () {
            document.getElementById('box2').innerHTML = "box2 write by js"
        }
    }

    module.exports = box2;
})